Fossil fuels or mineral fuels are fossil source fuels found within the top layer of the Earth’s crust. They were formed from the remains of dead plants and animals. The term fossil fuel includes hydrocarbon containing natural resources that are not derived from animal or plant sources. Fossil fuel buried combustible geologic deposits of organic materials, formed from decayed plants and animals that have been converted to crude oil, coal, natural gas, or heavy oils by exposure to heat and pressure in the Earth’s crust millions of years ago.Petroleum is formed from the preserved remains of organisms including phytoplankton and zooplankton that settled at the bottom of water in large quantities. They were formed under anoxic conditions, in which the organic matter mixed with mud and was buried under heavy layers of sediment. This resulting in high levels of heat and pressure which caused organic matter to chemically change during diagenesis. It first started into a waxy material known as

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